Wireless charging is actually a new application of traditional electromagnetic induction technology, wireless charging, also known as inductive charging, is the use of near-field induction, that is, inductance coupling, by the power supply equipment (charger) to transmit energy to the power of the device, the device using the received energy to charge the battery, and at the same time for its own operation, Because the charger and the electrical device between the inductance coupled transmission of energy, the two can not be connected by wire.